[1.7.x] Fixed #23674 -- Fixed a crash when a MultiValueField has invalid data.

Backport of 0dea81cd6d34b3e41cc4bbec99b5fdf06142b09e from master

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/forms_tests/tests/test_forms.py b/tests/forms_tests/tests/test_forms.py
index b79f53d6cb..6c13cf4177 100644
--- a/tests/forms_tests/tests/test_forms.py
+++ b/tests/forms_tests/tests/test_forms.py
@@ -1952,6 +1952,22 @@ class FormsTestCase(TestCase):
         self.assertFalse(id(field2.fields[0].choices) ==
                          id(field.fields[0].choices))
 
+    def test_multivalue_initial_data(self):
+        """
+        #23674 -- invalid initial data should not break form.changed_data()
+        """
+        class DateAgeField(MultiValueField):
+            def __init__(self, fields=(), *args, **kwargs):
+                fields = (DateField(label="Date"), IntegerField(label="Age"))
+                super(DateAgeField, self).__init__(fields=fields, *args, **kwargs)
+
+        class DateAgeForm(Form):
+            date_age = DateAgeField()
+
+        data = {"date_age": ["1998-12-06", 16]}
+        form = DateAgeForm(data, initial={"date_age": ["200-10-10", 14]})
+        self.assertTrue(form.has_changed())
+
     def test_multivalue_optional_subfields(self):
         class PhoneField(MultiValueField):
             def __init__(self, *args, **kwargs):